The phrase 'design color pictures watercolor multi-dimensional' refers to a style of artwork where color design is a central aspect, often seen in watercolor painting, which allows for a wide range of textures and layers. This style is characterized by the use of watercolor paints, which are known for their transparency and ability to create a variety of effects. Artists may explore different dimensions in their work, such as depth, perspective, and emotion, through the use of color, composition, and technique.